Abstract
We explore a simple cosmological model in the minisuperspace approach. The global structure of the model leads to subtleties in its quantization which are treated using the affine, rather than the Heisenberg, algebra. We develop a path-integral formulation for this algebra, and apply it to our cosmological model. We investigate the Friedmann-Robertson-Walker universe with a scalar field as source and discuss in detail the constraint that the universe have positive radius.
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